Fogatti Tankless Troubleshooting
The Short Answer: Fogatti is a compact gas tankless, not a Rinnai and not a 50-gallon. Portable boxes are D-cell LP, about one fixture. Indoor 6.6 GPM-class units are 120-volt and must vent. Cold water is empty bottles, dead batteries, no flow, a tripped ODS, a packed inlet, or E1. Do not crack flares. If you smell propane, shut it down.
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Search Intent & The Real Problem
The white box is passing cold water, clicking, or the display is throwing a letter code. Marketing said “6.6 GPM endless hot water.” Physics said a portable is one shower in July, and an indoor Fogatti still needs real gas, a real flue, and activation flow. People paste Rinnai 11/12 onto a battery igniter and a Chinese JSD-class board. Name the platform first. Cousin portables: Camplux, Excel, Marey not igniting. RV tankless with a Girard or Suburban badge is not Fogatti — Girard.
What other guides get wrong
They treat Fogatti like a condensing Navien: 3” PVC, code 11, a 199,000 BTU manifold. A patio box is ~1.5–2.5 GPM. They tell you to run vent-free in a sealed bedroom. They skip the D-cells, so you buy a gas valve for $3 of batteries. They paste generic E01–E05 charts that do not match your sticker — portable codes are not indoor 6.6 charts. And they tell you to soap-test a smelling patio with the igniter still sparking.
Step-by-Step Troubleshooting
Step 1: Read the plate — portable LP vs indoor vented vs electric
| What you are looking at | Fuel / vent | What it can actually do |
|---|---|---|
| Compact outdoor box, D-cells or hydro-gen, shower hose, no flue | LP portable | One sink or a low-flow shower. Not a house |
| Indoor 6.6 GPM-class, 120 V, flue collar, remote | NG or LP, must vent | Small whole-house only if the gas and flue are real |
| Electric Fogatti, no burner, two hot legs | 240 V elements | Wrong article — electric tankless goes cold |
| RV door with Girard / Suburban / Furrion badge | Different OEM | Wrong article |
- What to look for: Model, fuel (LP vs NG), vent-free vs a real flue. Photo of any error digits and the sticker that defines them.
- Required tools: Flashlight, phone camera.
A vent-free Fogatti in a tight coach without a working ODS is a CO appliance, not a “no flue needed” feature.
Step 2: Fuel, batteries, and a real call for heat
- What to look for: LP bottles open, not empty, changeover not stuck on reserve. NG cock parallel to the pipe. Two D-cells fresh and oriented correctly on battery-ignition models. Hydro-gen models need enough flow to spin the generator — a trickle will not spark. Powered indoor: 120 V present, display alive. Manifold: LP typically ~10–11 in. w.c., NG ~3.5–7 in. w.c. vs that plate. A manometer is licensed. Do not crack a flare to “see if you have gas.”
- Required tools: LP gauge, fresh D-cells, eyes on the cock.
Other LP appliances dead in the same hour is the tank or regulator, not the Fogatti. No click at all on a piezo portable is piezo will not spark, not a heat exchanger. Click with no flame is Camplux not lighting physics on this badge — burner not lighting.
Step 3: Water flow, inlet screen, and the GPM ceiling
- What to look for: Isolation valves open. Inlet screen packed with well sand or campground grit. Fogatti marketing is low-pressure startup. That is not a magic 4 GPM heater. A 2.5 GPM shower on a 1.6 GPM box in 50°F inlet water is lukewarm with a healthy burner. That is math, not a failed exchanger. Activation is still real: no flow, no fire. House or city static over ~80 psi belongs on a regulator, not on a “boost” knob.
- Required tools: Faucet, a jug and a watch if you need GPM. Screen cleaning with water off.
Crossover test: close cold to the heater, open a hot faucet. Pressurized flow means a mixing cartridge is dumping cold into hot.
Step 4: Ignition, ODS, and the E-code on your sticker
Confirm against the cabinet. Portable maps and indoor 6.6 maps are not twins.
| Code (many Fogatti digitals — verify sticker) | Meaning | First move |
|---|---|---|
| E1 | Ignition failure | Gas, water open, one reset — then licensed |
| E2 | Flame lost / unexpected flame (chart-dependent) | Empty bottle, flame rod — or shut gas if it says residual flame |
| E3 | Overheat / dry fire | Flow, then licensed. Do not keep firing |
| E5 | Fan / pressure switch on vented indoor | Flue, 120 V, blower — not a thermocouple |
| E0 / E4 | Temperature sensor | Wiring, then licensed sensor |
- What to look for: Spark at the burner with gas off (one look, then bottles closed if you smell it). Spark, no flame: fuel. Flame, then ODS drop: starved oxygen, blocked grille, or a bad ODS — do not bypass. Indoor unit that lights then dies is flame rod, flue, or gas pressure. A bang on a late light is delayed ignition — shut it down. Do not purge fittings.
- Required tools: View of the burner with fuel off. The sticker.
Two failed trials and most boards lock out. A third E1 is a tech, not a ritual.
Step 5: When the box is actually done
- What to look for: Yellow lazy flame, soot on the jacket, anyone dizzy — CO, not a parts order. Water in the cabinet after a freeze night with power off. Scale trails and repeating E3. Scorched board after someone ran it dry. T&P (typical 150 psi / 210°F) streaming on an indoor unit — never cap it. Thermocouple ~20–30 mV and thermopile hundreds of millivolts are tank-valve numbers. They do not apply to this flame rod. 4500 W / 240 V ~18.8 A / ~12–13 Ω is a house-tank element, not this gas box.
- Required tools: None on LP fittings. Paper towel for a leak.
A $200 Amazon box with a cooked exchanger is replacement, not a third solenoid.
When DIY Ends: Calling a Licensed Pro
You may confirm bottles, swap D-cells, clean an inlet screen with water off, and try one ignition after the cause is fixed. Stop at propane odor, a yellow sooting flame, a silent indoor fan, a wet board, and any gas-valve or ODS work. A licensed tech measures manifold pressure, proves the flue, and leak-tests. A vent-free Fogatti in a bedroom is not a “small Rinnai.”
Frequently Asked Questions
Q: Why is my Fogatti tankless not heating? A: Empty LP, dead batteries, no activation flow, a packed inlet screen, a tripped ODS, or an E1 ignition lockout. Read the plate — portable, indoor vented, and electric Fogatti are three machines.
Q: What does E1 mean on a Fogatti tankless? A: On most Fogatti stickers, E1 is ignition failure: spark ran, flame never proved. Confirm your label. Fix fuel and flow, reset once. If it returns, hire a licensed tech.
Q: Can I run a Fogatti tankless indoors without a vent? A: Only if that exact unit is listed vent-free and the space has working ventilation and a live ODS. A yellow flame, soot, or dizziness is carbon monoxide — shut it off. Indoor 6.6 GPM-class units must vent.